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Aero Precision M4E1 Threaded 16" .223 Wylde Fluted Complete Upper Receiver with ATLAS R-ONE Handguard - Anodized Bl
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Aero Precision M5 22" 6.5 Creedmoor SS Complete Upper Receiver w/ ATLAS S-ONE Handguard - Cerakote FDE - APAR538115
Aero Precision M4E1 Threaded 16" .223 Wylde SS QPQ Complete Upper Receiver with 15" M-LOK ATLAS S-ONE Handguar
Aero Precision M4E1 Enhanced Gas Piston Complete Upper with 18" .223 Wylde Rifle Length Barrel & 15" Enhan
Aero Precision M5E1 Complete Upper, 22" 6.5 Creedmoor Rifle Length Barrel with 15" M-LOK Handguard & Adjus